diff --git a/tools/build/build.py b/tools/build/build.py
index e87bf29f..c5087c9a 100755
--- a/tools/build/build.py
+++ b/tools/build/build.py
@@ -92,7 +92,9 @@ def build_oxjs(geo):
         data[1].append(js_dir + filename)
     filenames = filenames[0] + filenames[1]
     for filename in os.listdir(source_path + js_dir):
-        if not filename in filenames:
+        if not filename in filenames \
+                and not filename.startswith('.') \
+                and not filename.endswith('~'):
             filenames.append(filename)
     for filename in filenames:
         js += read_file(source_path + js_dir + filename) + '\n'